Battery device and electric device

Abstract

The battery device comprises a box body, a plurality of single batteries and a heat exchange assembly, the box body comprises a side beam, the side beam comprises a first side beam, a current collecting cavity is formed in the first side beam, a first through hole communicated with the current collecting cavity is formed in the upper surface of the first side beam, the single batteries are arranged in the box body, and the heat exchange assembly is arranged in the box body. The heat exchange assembly comprises a plurality of heat exchange parts, the heat exchange parts are used for exchanging heat with the single batteries, heat exchange flow channels are formed in the heat exchange parts, the first through holes are formed in the extending direction of the first edge beam at intervals, and the end of each heat exchange part is connected to the corresponding first through hole, so that the heat exchange flow channel of each heat exchange part communicates with the flow collecting cavity. According to the battery device provided by the embodiment of the invention, the arrangement of a collecting pipe is omitted, the space occupied by the collecting pipe can be reduced, and the space occupied by the heat exchange piece on the inner side of the first edge beam can also be reduced, so that more battery monomers can be accommodated in the space on the inner side of the first edge beam, and the energy density of the battery device is favorably improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery device and an electrical device. Background Art

[0002] In the related art, the battery device includes a plurality of battery cells and a box for accommodating these battery cells. In order to enable these battery cells to work stably and reliably, a heat exchange component is usually arranged in the box to adjust the temperature of the battery cells. However, the heat exchange component occupies a large space, resulting in low space utilization inside the box, resulting in low energy density of the battery device. Therefore, there is room for improvement. Utility Model Content

[0003] In view of the above problems, the present application provides a battery device and an electrical device, wherein the space utilization rate in the box of the battery device is high, thereby improving the energy density of the battery device.

[0004] In a first aspect, the present application provides a battery device, comprising: a box body, the box body comprising side beams, the side beams comprising a first side beam, a collecting chamber is provided in the first side beam, and a first through hole connected to the collecting chamber is provided on the upper surface of the first side beam; a plurality of battery cells, a plurality of the battery cells are arranged in the box body; a heat exchange assembly, the heat exchange assembly comprising a plurality of heat exchange elements, the heat exchange elements are used to exchange heat with the battery cells, the heat exchange elements have heat exchange channels, there are a plurality of first through holes and are arranged at intervals along the extension direction of the first side beam, and an end of each of the heat exchange elements is connected to the corresponding first through hole, so that the heat exchange channel of each of the heat exchange elements is connected to the collecting chamber.

[0005] In the above technical solution, the space inside the first side beam is utilized. A collecting chamber is formed inside the first side beam and the end of the heat exchange element is directly connected to the collecting chamber through the first through hole on the first side beam. This can realize the process of heat exchange medium flowing between the heat exchange element and the collecting chamber. There is no need to set up a collecting tube separately, which reduces the number of parts. The omitted collecting tube can save space in the box for placing more battery cells, thereby improving the utilization rate of the internal space of the box. Moreover, the first through hole is formed on the upper surface of the first side beam, so that at least part of the heat exchange element can be located on the upper part of the first side beam to be connected to the collecting chamber, which can further reduce the occupation of the space inside the first side beam by the heat exchange element. In this way, more battery cells can be accommodated in the space inside the first side beam, which is beneficial to improving the energy density of the battery device.

[0006] In some embodiments, the first side beam includes a first side beam body and a first side beam boss, the first side beam boss is connected to the inner side of the first side beam body, the first side beam boss is provided with the collecting cavity, the upper surface of the first side beam body is the first surface, the upper surface of the first side beam boss is the second surface, the second surface is provided with the first through hole, and the second surface is lower than the first surface.

[0007] In the above technical solution, the upper surface of the first side beam body through the first side beam is the first surface, the upper surface of the first side beam boss is the second surface, the second surface is provided with a first through hole and the second surface is lower than the first surface, so that at least part of the end of the heat exchanger can be located above the second surface, and the first through hole is inserted downward to connect the heat exchanger with the collecting chamber. By at least part of the end of the heat exchanger is located in this space above the second surface, the space inside the first side beam boss can be as large as possible, reducing the occupation of the space inside the first side beam boss by the heat exchanger, so that the space inside the first side beam boss can accommodate more battery cells, which is beneficial to improving the overall energy density of the battery device.

[0008] In some embodiments, a height difference between the first surface and the second surface is h, a dimension of the first side beam body in a vertical direction is d1, and a ratio of h to d1 is in a range of 0.3 to 0.7.

[0009] In the above technical solution, the ratio of the height difference h between the first surface and the second surface to the dimension d1 of the first side beam body in the up-down direction is in the range of 0.3~0.7, which can facilitate at least a part of the end of the heat exchange element to be located in the space between the first surface and the second surface in the up-down direction, thereby reducing the space occupied by the heat exchange element on the inner side of the first side beam boss, and also can make the dimension of the first side beam boss in the up-down direction larger, so that the heat exchange medium can flow more smoothly in the collecting cavity, which is beneficial to improve the heat exchange efficiency.

[0010] In some embodiments, a dimension of the first side beam body in the up-down direction is d1, a dimension of the first side beam boss in the up-down direction is d2, and a ratio of d2 to d1 ranges from 0.3 to 0.7.

[0011] In the above technical solution, the ratio of the dimension d2 of the first side beam boss in the up-down direction to the dimension d1 of the first side beam body in the up-down direction is in the range of 0.3~0.7, so that the dimension of the first side beam boss in the up-down direction can be made larger, so that the heat exchange medium can flow more smoothly in the collecting cavity; it can also facilitate at least a part of the end of the heat exchange element to be located in the space between the first surface and the second surface in the up-down direction, thereby reducing the space occupied by the heat exchange element on the inner side of the first side beam boss.

[0012] In some embodiments, an end portion of the heat exchange element is inserted into the first through hole.

[0013] In the above technical solution, by inserting the end of the heat exchanger into the first through hole and connecting with the collecting chamber, the sealing between the first through hole and the end of the heat exchanger can be enhanced, and the possibility of leakage of the heat exchange medium from the gap between the first through hole and the end of the heat exchanger can be reduced. In addition, the contact area between the end of the heat exchanger and the first side beam can be enhanced, and the connection strength between the heat exchanger and the first side beam can be improved.

[0014] In some embodiments, the heat exchange element includes a heat exchange body and a heat exchange joint, the heat exchange joint is connected to the end of the heat exchange body and constitutes the end of the heat exchange element, the heat exchange flow channel is formed in the heat exchange body, and a connecting cavity is formed in the heat exchange joint, the connecting cavity connects the heat exchange flow channel and the collecting cavity, and the heat exchange joint and the heat exchange body are independently formed.

[0015] In the above technical solution, a connecting cavity is formed in the heat exchange joint and a heat exchange channel is formed in the heat exchange body. For example, at least a portion of the heat exchange joint can be inserted into the first through hole, so that the heat exchange channel and the collecting cavity can be connected, thereby realizing the flow of heat exchange medium between the heat exchange channel and the collecting cavity; and, the heat exchange joint and the heat exchange body are independently formed, which can facilitate the processing and manufacturing of the heat exchange joint and the heat exchange body, and can also facilitate the replacement or maintenance of the heat exchange joint or the heat exchange body.

[0016] In some embodiments, the heat exchange joint is welded to the first side beam.

[0017] In the above technical solution, the heat exchange joint is welded to the first side beam, so that the connection between the heat exchange joint and the first side beam can be simple and have strong stability.

[0018] In some embodiments, a connecting weld is formed between the heat exchange joint and the first side beam, and the connecting weld surrounds the outer circumference of the heat exchange joint and seals the gap between the inner circumferential wall of the first through hole and the outer circumference of the heat exchange joint.

[0019] In the above technical solution, by surrounding the outer peripheral side of the heat exchange joint with the connecting weld and sealing the gap between the inner peripheral wall of the first through hole and the outer peripheral side of the heat exchange joint with the connecting weld, the gap between the inner peripheral wall of the first through hole and the outer peripheral side of the heat exchange joint can be better sealed, effectively reducing or avoiding the possibility of leakage of the cooling medium in the gap between the inner peripheral wall of the first through hole and the outer peripheral side of the heat exchange joint.

[0020] In some embodiments, the heat exchange joint is connected to the heat exchange body by welding; or, the heat exchange joint is connected to the heat exchange body by adhesive bonding.

[0021] In the above technical scheme, by welding the heat exchange joint to the heat exchange body, the connection method between the heat exchange joint and the heat exchange body can be simple and have strong stability; by bonding the heat exchange joint to the heat exchange body, the connection method between the heat exchange joint and the heat exchange body can be simple and have strong stability.

[0022] In some embodiments, the heat exchange body is formed as a heat exchange flat tube and extends along a first direction, the first direction intersects with the up and down direction, the width direction of the heat exchange flat tube is consistent with the up and down direction, the heat exchange joint is connected to the end of the heat exchange body along the first direction, the graphic area enclosed by the outer contour line of the cross-section of the heat exchange body is the first cross-sectional area, the cross-sectional area of ​​the first through hole is the second cross-sectional area, and the second cross-sectional area is smaller than the first cross-sectional area.

[0023] In the above technical solution, the heat exchange body is formed into a heat exchange flat tube and the heat exchange body extends along the first direction, the first direction intersects with the up-down direction, and the width direction of the heat exchange flat tube is consistent with the up-down direction, so that the heat exchange area of ​​the heat exchange flat tube facing the battery cell side can be larger, which can improve the heat exchange efficiency between the heat exchange element and the battery cell; and the second cross-sectional area of ​​the first through hole is smaller than the first cross-sectional area of ​​the figure enclosed by the outer contour line of the cross-sectional area of ​​the heat exchange body. The larger first cross-sectional area can make the size of the heat exchange flow channel inside the heat exchange body larger, so that the heat exchange medium can flow more smoothly inside the heat exchange body, which is beneficial to improve the heat exchange efficiency.

[0024] In some embodiments, an end of the heat exchange body is inserted into the heat exchange joint.

[0025] In the above technical solution, by inserting the end of the heat exchange body into the heat exchange joint, the sealing between the heat exchange joint and the end of the heat exchange body can be enhanced, and the possibility of leakage of the heat exchange medium from the gap between the heat exchange joint and the end of the heat exchange body can be reduced. In addition, the contact area between the end of the heat exchange body and the heat exchange joint can be enhanced, and the connection strength between the heat exchange body and the heat exchange joint can be improved.

[0026] In some embodiments, the heat exchange joint includes a first joint portion and a second joint portion, the first joint portion is connected between the second joint portion and the heat exchange body, part of the connecting cavity is formed at the first joint portion and the other part of the connecting cavity is formed at the second joint portion, the second joint portion is formed into a columnar shape extending in the up and down directions, the second joint portion includes a first section and a second section connected to the lower side of the first section, the first joint portion is connected to the first section, and the second section is inserted into the first through hole.

[0027] In the above technical solution, the first joint part is connected between the second joint part and the heat exchange body, the second joint part includes a first section and a second section connected to the lower side of the first section, the first joint part is connected to the first section and the second section is inserted into the first through hole, so that the connection between the connecting cavity and the collecting channel can be realized, so that the heat exchange medium can flow between the heat exchange flow channel and the collecting channel through the connecting cavity; and, by arranging the first section and the second section in the up and down direction, the space in the up and down direction can be fully utilized to reduce the space occupied by the heat exchange joint on the inner side of the first side beam.

[0028] In some embodiments, a cross section of the first through hole is circular, and an outer peripheral contour of the second joint portion is circular.

[0029] In the above technical solution, the cross-section of the first through hole is circular and the outer peripheral contour of the second joint part is circular, which can play a positioning role when the heat exchange joint is assembled with the first side beam, so that the second joint part can be inserted into the first through hole more smoothly and accurately, which is beneficial to improving the assembly efficiency; and the cross-section of the first through hole is circular and the outer peripheral contour of the second joint part is circular, so that the cross-sectional area of ​​the second joint part and the first through hole can be as close as possible, which can reduce the flow resistance of the heat exchange medium when it flows at the connection between the first through hole and the second joint part, so that the heat exchange medium can flow more smoothly from the collecting chamber through the first through hole to the second joint part or from the second joint part through the first through hole to the collecting chamber, which is beneficial to improving the heat exchange efficiency of the heat exchange component.

[0030] In some embodiments, the heat exchange body is formed as a heat exchange flat tube and extends along a first direction, the first direction intersects with the up and down direction, the width direction of the heat exchange flat tube is consistent with the up and down direction, the heat exchange joint is connected to the end of the heat exchange body along the first direction, the first joint part is formed in a flat shape and the thickness direction of the first joint part is consistent with the thickness direction of the heat exchange flat tube.

[0031] In the above technical solution, the first joint part is formed into a flat shape and the thickness direction of the first joint part is consistent with the thickness direction of the heat exchange flat tube, so that the connection area between the first joint part and the heat exchange flat tube can be larger. Compared with the first joint part being round, the connection strength between the first joint part and the heat exchange flat tube can be enhanced. When the first joint part and the heat exchange flat tube are assembled, the flat shape of the first joint part can play a positioning role, so that the assembly position of the heat exchange joint and the heat exchange flat tube is accurate and can play a role in rapid positioning, which reduces the assembly time and difficulty and is conducive to improving the assembly efficiency.

[0032] In some embodiments, the first joint portion includes a first connection portion and a second connection portion, the first connection portion is connected to the heat exchange body, the second connection portion is connected between the first connection portion and the second joint portion, the second connection portion is located above the first through hole, the width of the first connection portion in the up and down direction is W1, the width of the second connection portion in the up and down direction is W2, and W2 is smaller than W1.

[0033] In the above technical solution, the second connection part is located above the first through hole and the width W2 of the second connection part in the up-down direction is smaller than the width W1 of the first connection part in the up-down direction. While the heat exchange body is connected to the first through hole via the first connection part and the second connection part, the wider first connection part can make the connection area between the first connection part and the heat exchange body larger, so that the first joint part and the heat exchange body have a stronger connection strength, and the narrower second connection part can reduce the occupation of the inner space of the first side beam, thereby allowing the inner side of the first side beam to accommodate more battery cells, which is beneficial to improving the overall energy density of the battery device.

[0034] In some embodiments, the ratio of W2 to W1 ranges from 0.2 to 0.5.

[0035] In the above technical solution, by setting the ratio of W2 to W1 in the range of 0.2 to 0.5, the width of the second connection part in the up-down direction can be made larger, so that the heat exchange medium can flow more smoothly in the second connection part. The width of the first connection part in the up-down direction can also be made larger, so that the connection area between the first connection part and the heat exchange body is larger, thereby making the first joint part and the heat exchange body have a stronger connection strength.

[0036] In some embodiments, a portion of the first connection portion is located below the first through hole, and a portion of the first connection portion is located above the first through hole.

[0037] In the above technical solution, by partially locating the first connection part above the first through hole, the space in the up and down directions can be fully utilized, so that the width of the first connection part in the up and down directions can be larger, thereby making the connection area between the first connection part and the heat exchange body larger, and effectively enhancing the connection strength between the first connection part and the heat exchange body.

[0038] In some embodiments, the heat exchange body is formed as a heat exchange flat tube, and a plurality of heat exchange channels arranged at intervals along the width direction of the heat exchange flat tube are formed in the heat exchange body, and all the heat exchange channels in the heat exchange body are connected to the connecting cavity.

[0039] In the above technical solution, a plurality of heat exchange channels are formed in the heat exchange main body and are arranged at intervals along the width direction of the heat exchange flat tubes, and all the heat exchange channels are connected to the connecting cavity, so that the heat exchange channels and the manifold cavity can be connected to facilitate the flow of heat exchange medium between the manifold cavity and the heat exchange channels; and by arranging the plurality of heat exchange channels at intervals along the width direction of the heat exchange flat tubes, the heat exchange area between the heat exchange main body and the battery cell can be increased, thereby enhancing the heat exchange efficiency of the heat exchange component to the battery cell.

[0040] In some embodiments, there are two first side beams, and the two first side beams are opposite to each other and spaced apart along the first direction. Each of the first side beams is formed with the collecting chamber and a plurality of the first through holes spaced apart along the second direction. The second direction, the first direction, and the up and down directions intersect each other. One of the two first side beams is provided with a liquid inlet hole connected to the collecting chamber, and a liquid inlet pipe is connected to the liquid inlet hole. The other of the two first side beams is provided with a liquid outlet hole connected to the collecting chamber, and a liquid outlet pipe is connected to the liquid outlet hole. A plurality of the heat exchange elements are spaced apart along the second direction, and at least some of the battery cells are located between adjacent heat exchange elements. The two ends of each heat exchange element along the first direction are respectively connected to the corresponding first through holes on the two first side beams, and the heat exchange channel in each heat exchange element is connected to the collecting chambers in the two first side beams.

[0041] In the above technical scheme, a liquid inlet hole connecting the collecting chamber and the liquid inlet pipe is provided on one of the first side beams, and a liquid outlet hole connecting the collecting chamber and the liquid outlet pipe is provided on the other first side beam. The heat exchange medium flows from the liquid inlet pipe into the corresponding collecting chamber through the liquid inlet hole, and is diverted from the collecting chamber to the heat exchange channels of each heat exchange component to exchange heat with the battery cells. The heat exchange medium after heat exchange in each heat exchange channel flows to the collecting chamber corresponding to the liquid outlet hole, and then flows out through the liquid outlet pipe. Moreover, since at least part of the battery cells are located between adjacent heat exchange components, and since the temperature of the heat exchange medium can be adjusted, the heat exchange medium in the heat exchange channel of the heat exchange component can exchange heat with the battery cells, which is beneficial to extending the service life of the battery cells.

[0042] In some embodiments, the liquid inlet hole is formed on the upper surface of the first side beam, and the liquid outlet hole is formed on the upper surface of the first side beam.

[0043] In the above technical solution, the liquid inlet hole is formed on the upper surface of the first side beam and the liquid outlet hole is formed on the upper surface of the first side beam, so that the liquid inlet pipe or the liquid outlet pipe can be located above the first side beam to be connected with the liquid inlet hole or the liquid outlet hole, thereby reducing the space occupied by the inner side of the first side beam, so that more battery cells can be accommodated in the space inside the first side beam, which is beneficial to improve the energy density of the battery device.

[0044] In some embodiments, the liquid inlet and the liquid outlet are both arranged at one end of the first side beam along the second direction, and the liquid outlet and the liquid inlet are located at the same end of the first side beam along the second direction.

[0045] In the above technical solution, the liquid inlet hole and the liquid outlet hole are both arranged at one end of the first side beam along the second direction, and the liquid outlet hole and the liquid inlet hole are located at the same end of the first side beam along the second direction, so that the liquid inlet pipe and the liquid outlet pipe can be more concentratedly arranged on the same side of the box body, which can effectively save the space inside the box body, reduce the crossing or detour of the liquid inlet pipe or the liquid outlet pipe inside the box body, and is conducive to the optimization of the layout inside the box body.

[0046] In a second aspect, the present application provides an electrical device, including: a battery device implemented according to the first aspect of the present application.

[0047] In the above technical scheme, by utilizing the space inside the first side beam of the battery device, by forming a collecting chamber inside the first side beam and directly connecting the end of the heat exchange element with the collecting chamber via the first through hole on the first side beam, the process of heat exchange medium flowing between the heat exchange element and the collecting chamber can be realized, and there is no need to set up a collecting tube separately, thereby reducing the number of parts and components. The omitted collecting tube can save space in the box for placing more battery cells, thereby improving the utilization rate of the internal space of the box; and, by forming the first through hole on the upper surface of the first side beam, at least part of the heat exchange element can be located on the upper part of the first side beam to connect with the collecting chamber, which can further reduce the occupation of the space inside the first side beam by the heat exchange element. In this way, more battery cells can be accommodated in the space inside the first side beam, which is beneficial to improving the energy density of the battery device.

[0048] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0050] Figure 1 is a schematic diagram of a partial structure of a battery device according to some embodiments of the present application Figure 1 ;

[0051] Figure 2 yes Figure 1 Schematic diagram of a partial structure of a battery device in Figure 2 ;

[0052] Figure 3 yes Figure 1 Schematic diagram of a partial structure of a battery device in Figure 3 ;

[0053] Figure 4 yes Figure 1 Schematic diagram of a partial structure of a battery device in Figure 4 ;

[0054] Figure 5 yes Figure 1 Schematic diagram of a partial structure of a battery device in Figure 5 ;

[0055] Figure 6 yes Figure 1 Schematic diagram of a partial structure of a battery device in Figure 6 ;

[0056] Figure 7 yes Figure 6 The enlarged view of point A in the middle;

[0057] Figure 8 yes Figure 6 The enlarged view of point B in the middle;

[0058] Fig. 9 yes Figure 6 Enlarged view of point C in the middle;

[0059] Fig.10 is a simplified schematic diagram of an electrical device according to some embodiments of the present application.

[0060] Reference numerals:

[0061] 1000. Vehicles;

[0062] 100. Battery device;

[0063] 20, box body; 21, first side beam; 211, manifold; 2111, first through hole; 212, first side beam body; 2121, first surface; 213, first side beam boss; 2131, second surface;

[0064] 30. heat exchange assembly; 31. heat exchange element; 311. heat exchange body; 312. heat exchange joint; 313. first joint portion; 3131. first connection portion; 3132. second connection portion; 314. second joint portion; 3141. first section;

[0065] 41. liquid outlet pipe; 42. liquid inlet pipe;

[0066] 200. Car body. DETAILED DESCRIPTION

[0067] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0068] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0069] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0070] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0071] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0072] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0073] The term “plurality” used in this application refers to two or more (including two).

[0074] In the embodiments of the present application, unless otherwise specified, all implementation modes and optional implementation modes of the present application can be combined with each other to form a new technical solution.

[0075] In the embodiments of the present application, unless otherwise specified, all technical features and optional technical features of the present application can be combined with each other to form a new technical solution.

[0076] In an embodiment of the present application, a battery apparatus may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include a plurality of battery cells, which are connected in series, in parallel, or in mixed connection through a busbar. For example, a battery cell assembly is usually formed by arranging a plurality of battery cells; a battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, a battery module may be formed by bundling a plurality of battery cells by cable ties.

[0077] The battery device may be a battery pack, which includes a box and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box. The battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box; the battery cell assembly may also be accommodated in the box by directly fixing a plurality of battery cells to the box.

[0078] In an embodiment of the present application, the box may include a first box and a second box. The first box and the second box are buckled together to form a closed space inside the box to accommodate the battery monomer assembly. The closed here means covering or closing, which can be sealed or unsealed. The first box may be a top cover or a bottom plate. For example, the box may include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box to accommodate the battery monomer assembly.

[0079] In the embodiment of the utility model, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the crossbeam and longitudinal beam of the vehicle.

[0080] In the embodiments of the present application, the battery cell may be a secondary battery, which refers to a battery cell that can be used continuously by activating the active material by charging after the battery cell is discharged; the battery cell may be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc., which is not limited in the embodiments of the present application. The battery cell may be cylindrical, flat, rectangular or in other shapes, which is not limited in the embodiments of the present application. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, which is not limited in the embodiments of the present application.

[0081] At present, judging from the development of the market situation, the application of batteries is becoming more and more extensive. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0082] In the related art, the battery device includes a plurality of battery cells and a box for accommodating these battery cells. In order to enable these battery cells to work stably and reliably, a heat exchange component is usually arranged in the box to adjust the temperature of the battery cells. However, due to the structural limitations of the heat exchange component itself, the heat exchange component occupies a large space, resulting in low space utilization inside the box, resulting in low energy density of the battery device. Therefore, there is room for improvement.

[0083] Based on this, the present application proposes a battery device, which includes a box body, multiple battery cells and a heat exchange assembly, the box body includes a side beam, the side beam includes a first side beam, a collecting chamber is provided in the first side beam, and a first through hole connected to the collecting chamber is provided on the upper surface of the first side beam. Multiple battery cells are arranged in the box body, and the heat exchange assembly includes multiple heat exchange elements, which are used to exchange heat with the battery cells, and have heat exchange channels in the heat exchange elements. There are multiple first through holes and they are arranged at intervals along the extension direction of the first side beam, and the end of each heat exchange element is connected to the corresponding first through hole so that the heat exchange channel of each heat exchange element is connected to the collecting chamber.

[0084] In the above-mentioned battery device, by utilizing the space inside the first side beam, a collecting chamber is formed inside the first side beam and the end of the heat exchange element is directly connected to the collecting chamber through the first through hole on the first side beam, so that the heat exchange medium can flow between the heat exchange element and the collecting chamber. There is no need to set up a collecting tube separately, which reduces the number of parts. The omitted collecting tube can save space in the box for placing more battery cells, thereby improving the utilization rate of the internal space of the box; and, by forming the first through hole on the upper surface of the first side beam, at least a part of the heat exchange element can be located on the upper part of the first side beam to be connected to the collecting chamber, which can further reduce the occupation of the space inside the first side beam by the heat exchange element. In this way, more battery cells can be accommodated in the space inside the first side beam, which is beneficial to improving the energy density of the battery device.

[0085] The battery device disclosed in the embodiment of the utility model can be used in electrical equipment that uses the battery device as a power source or various energy storage systems that use the battery device as an energy storage element. In addition to being used in vehicles, the battery device can also be used for, but not limited to, mobile phones, tablets, laptops, electric toys, electric tools, battery cars, electric cars, ships, spacecraft, etc. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecrafts, etc.

[0086] The power-consuming device disclosed in the embodiments of the utility model may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device is provided inside the vehicle, and the battery device may be provided at the bottom, head or tail of the vehicle. The battery device may be used to power the vehicle, for example, the battery device may be used as an operating power source for the vehicle. The vehicle may also include a controller and a motor, and the controller is used to control the battery device to power the motor, for example, for the starting, navigation and working power requirements of the vehicle during driving. In some embodiments of the utility model, the battery device may be used not only as an operating power source for the vehicle, but also as a driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0087] Reference below Figure 1-Figure 10 A battery device 100 according to an embodiment of the present application is described.

[0088] Reference Figure 1-Figure 4In the first aspect, the present application provides a battery device 100, including a box body 20, a plurality of battery cells and a heat exchange assembly 30, the box body 20 includes a side beam, the side beam includes a first side beam 21, a manifold 21 is provided in the first side beam 21, a first through hole 2111 connected to the manifold 211 is provided on the upper surface of the first side beam 21, a plurality of battery cells are arranged in the box body 20, the heat exchange assembly 30 includes a plurality of heat exchange elements 31, the heat exchange elements 31 are used to exchange heat with the battery cells, a heat exchange flow channel is provided in the heat exchange element 31, there are a plurality of first through holes 2111 and the first through holes 2111 are arranged at intervals along the extension direction of the first side beam 21, and an end of each heat exchange element 31 is connected to the corresponding first through hole 2111 so that the heat exchange flow channel of each heat exchange element 31 is connected to the manifold 211.

[0089] For example, the first direction may refer to the X direction in the drawings, the second direction may refer to the Y direction in the drawings, and the up and down directions may refer to the Z direction in the drawings.

[0090] The housing 20 can support and protect multiple battery cells and the heat exchange assembly 30, reduce or avoid wear of the battery cells and the heat exchange assembly 30 caused by external impact, and help extend the overall service life of the battery device 100. The heat exchange flow channel in the heat exchange component 31 can facilitate the flow of the heat exchange medium to exchange heat for the battery cells. For example, the heat exchange medium can be a liquid such as water or ethylene glycol, and the temperature of the heat exchange medium can be adjusted. When the temperature of the battery cell is too high, the heat exchange medium can cool the battery cell. When the temperature of the battery cell is too low, the heat exchange medium can keep the battery cell warm and increase the service life of the battery cell.

[0091] A battery cell can be placed between two adjacent heat exchange elements 31 to exchange heat between the battery cells and improve the heat exchange effect, and multiple heat exchange elements 31 can be arranged at intervals along the extension direction of the first side beam 21 and the ends of the heat exchange elements 31 are connected to the corresponding first through holes 2111, so that the heat exchange medium in the heat exchange channels in the multiple heat exchange elements 31 flows into the collecting cavity 211 or the heat exchange medium in the collecting cavity 211 flows into the multiple heat exchange channels, so that the heat exchange medium in each heat exchange channel is distributed more evenly, thereby improving the temperature consistency of the battery cells.

[0092] By providing a manifold 211 in the first side beam 21, and the end of the heat exchanger 31 is connected to the manifold 211 through the first through hole 2111, so that the heat exchanger 31 is directly connected to the first side beam 21, the structural strength of the box body 20 can be enhanced, thereby improving the side collision resistance of the box body 20 and improving the overall reliability of the battery device 100; and the end of the heat exchanger 31 is directly connected to the manifold 211 provided inside the first side beam 21, and the space inside the first side beam 21 is utilized. A collecting chamber 211 is formed inside and the end of the heat exchange member 31 is directly connected to the collecting chamber 211 via the first through hole 2111 on the first side beam 21, so that the heat exchange medium can flow between the heat exchange member 31 and the collecting chamber 211. There is no need to set up a collecting pipe separately, thereby reducing the number of parts. The omitted collecting pipe can save space in the box body 20 for placing more battery cells, which can improve the utilization rate of the internal space of the box body 20, thereby helping to improve the energy density of the battery device 100.

[0093] Furthermore, by providing a first through hole 2111 on the upper surface of the first side beam 21, the heat exchange element 31 is connected to the collecting chamber 211 from the upper side of the first side beam 21, which can further reduce the space occupied by the heat exchange element 31 on the inner side of the first side beam 21, so that the inner side of the first side beam 21 can accommodate more battery cells, thereby further improving the energy density of the battery device 100.

[0094] In the above technical solution, the space inside the first side beam 21 is utilized. A collecting chamber 211 is formed inside the first side beam 21 and the end of the heat exchange element 31 is directly connected to the collecting chamber 211 through the first through hole 2111 on the first side beam 21. This can realize the process of heat exchange medium flowing between the heat exchange element 31 and the collecting chamber 211. There is no need to set up a collecting pipe separately, which reduces the number of parts. The omitted collecting pipe can save space in the box 20 for placing more battery cells, which can improve the utilization rate of the internal space of the box 20; and, by forming the first through hole 2111 on the upper surface of the first side beam 21, at least a part of the heat exchange element 31 can be located on the upper part of the first side beam 21 to be connected to the collecting chamber 211, which can further reduce the occupation of the space inside the first side beam 21 by the heat exchange element 31. In this way, more battery cells can be accommodated in the space inside the first side beam 21, which is beneficial to improve the energy density of the battery device 100.

[0095] Reference Figure 6-Figure 9In some embodiments, the first side beam 21 includes a first side beam body 212 and a first side beam boss 213, the first side beam boss 213 is connected to the inner side of the first side beam body 212, a collecting cavity 211 is provided in the first side beam boss 213, the upper surface of the first side beam body 212 is a first surface 2121, the upper surface of the first side beam boss 213 is a second surface 2131, the second surface 2131 is provided with a first through hole 2111, and the second surface 2131 is lower than the first surface 2121.

[0096] By making the first side beam 21 include a first side beam body 212 and a first side beam boss 213, and the first side beam boss 213 is connected to the inner side of the first side beam body 212, the first side beam boss 213 can be made closer to the heat exchange element 31 relative to the first side beam body 212, so that the distance between the heat exchange element 31 and the collecting cavity 211 of the first side beam boss 213 can be smaller, and the connection length between the heat exchange element 31 and the collecting cavity 211 can be reduced, so that the heat exchange medium in the heat exchange element 31 and the collecting cavity 211 can flow more rapidly.

[0097] In addition, a first through hole 2111 is provided through the second surface 2131 and the second surface 2131 is lower than the first surface 2121. For example, at least a portion of the end of the heat exchanger 31 can be located above the second surface 2131. The first through hole 2111 is inserted downward to connect the heat exchanger 31 with the collecting chamber 211. By allowing at least a portion of the end of the heat exchanger 31 to be located in the space above the second surface 2131, the space inside the first side beam boss 213 can be as large as possible, thereby reducing the occupation of the space inside the first side beam boss 213 by the heat exchanger 31, so that the space inside the first side beam boss 213 can accommodate more battery cells, which is beneficial to improving the overall energy density of the battery device 100.

[0098] It should be explained that the inner side of the first side beam body 212 refers to the side of the first side beam 21 close to the battery cell.

[0099] In the above technical scheme, the upper surface of the first side beam body 212 of the first side beam 21 is the first surface 2121, and the upper surface of the first side beam boss 213 is the second surface 2131. The second surface 2131 is provided with a first through hole 2111 and the second surface 2131 is lower than the first surface 2121, so that at least part of the end of the heat exchanger 31 can be located above the second surface 2131, and the first through hole 2111 is inserted downward to connect the heat exchanger 31 with the collecting chamber 211. By at least part of the end of the heat exchanger 31 is located in this space above the second surface 2131, the space inside the first side beam boss 213 can be as large as possible, reducing the occupation of the space inside the first side beam boss 213 by the heat exchanger 31, so that the space inside the first side beam boss 213 can accommodate more battery cells, which is beneficial to improving the overall energy density of the battery device 100.

[0100] Reference Figure 6-Figure 9 In some embodiments, the height difference between the first surface 2121 and the second surface 2131 is h, the dimension of the first side beam body 212 in the up and down direction is d1, and the ratio of h to d1 ranges from 0.3 to 0.7.

[0101] For example, the ratio of h to d1 can be 0.3, 0.4, 0.5, 0.6, or 0.7. By making the ratio of the height difference h between the first surface 2121 and the second surface 2131 to the dimension d1 of the first side beam body 212 in the up-down direction not less than 0.3, the height difference between the first surface 2121 and the second surface 2131 can be made larger, so that at least part of the end of the heat exchange element 31 is located in the space between the first surface 2121 and the second surface 2131 in the up-down direction, thereby reducing the space occupied by the heat exchange element 31 on the inner side of the first side beam boss 213; by making the ratio of the height difference h between the first surface 2121 and the second surface 2131 to the dimension d1 of the first side beam body 212 in the up-down direction not greater than 0.7, the dimension of the first side beam boss 213 in the up-down direction can be made larger, so that the height of the collecting cavity 211 in the up-down direction can be made larger, so that the heat exchange medium can flow more smoothly in the collecting cavity 211, which is beneficial to improving the heat exchange efficiency.

[0102] By setting the ratio of the height difference h between the first surface 2121 and the second surface 2131 to the dimension d1 of the first side beam body 212 in the up-down direction in the range of 0.3~0.7, it is possible to facilitate at least a portion of the end of the heat exchange element 31 to be located in the space between the first surface 2121 and the second surface 2131 in the up-down direction, thereby reducing the space occupied by the heat exchange element 31 on the inner side of the first side beam boss 213, and also making the dimension of the first side beam boss 213 in the up-down direction larger, so that the heat exchange medium can flow more smoothly in the collecting cavity 211, which is beneficial to improving the heat exchange efficiency.

[0103] In the above technical solution, the ratio range of the height difference h between the first surface 2121 and the second surface 2131 to the dimension d1 of the first side beam body 212 in the up and down directions is 0.3~0.7, which can facilitate at least a part of the end of the heat exchange element 31 to be located in the space between the first surface 2121 and the second surface 2131 in the up and down directions, thereby reducing the space occupied by the heat exchange element 31 on the inner side of the first side beam boss 213, and also can make the size of the first side beam boss 213 in the up and down directions larger, so that the heat exchange medium can flow more smoothly in the collecting cavity 211, which is beneficial to improve the heat exchange efficiency.

[0104] Reference Figure 6-Figure 9 In some embodiments, the size of the first side beam body 212 in the vertical direction is d1, the size of the first side beam boss 213 in the vertical direction is d2, and the ratio of d2 to d1 is in the range of 0.3 to 0.7.

[0105] For example, the ratio of d2 to d1 can be 0.3, 0.4, 0.5, 0.6, or 0.7. By making the ratio of the size d2 of the first side beam boss 213 in the vertical direction to the size d1 of the first side beam body 212 in the vertical direction not less than 0.3, the size of the first side beam boss 213 in the vertical direction can be made larger, so that the height of the manifold 211 in the vertical direction is larger, and the heat exchange medium can flow more smoothly in the manifold 211, which is beneficial to improving the heat exchange efficiency. The ratio of the dimension d2 of the first side beam body 212 in the vertical direction to the dimension d1 of the first side beam body 212 in the vertical direction is not greater than 0.7, which can make the height difference between the second surface 2131 of the first side beam boss 213 and the first surface 2121 of the first side beam body 212 in the vertical direction larger, so that at least part of the end of the heat exchange element 31 is located in the space between the first surface 2121 and the second surface 2131 in the vertical direction, thereby reducing the space occupied by the heat exchange element 31 on the inner side of the first side beam boss 213.

[0106] By setting the ratio of the dimension d2 of the first side beam boss 213 in the up-down direction to the dimension d1 of the first side beam body 212 in the up-down direction in the range of 0.3~0.7, the dimension of the first side beam boss 213 in the up-down direction can be made larger, so that the heat exchange medium can flow more smoothly in the collecting cavity 211; it can also facilitate at least a part of the end of the heat exchange element 31 to be located in the space between the first surface 2121 and the second surface 2131 in the up-down direction, thereby reducing the space occupied by the heat exchange element 31 on the inner side of the first side beam boss 213.

[0107] In the above technical solution, the ratio range of the dimension d2 of the first side beam boss 213 in the up-down direction to the dimension d1 of the first side beam body 212 in the up-down direction is 0.3~0.7, so that the dimension of the first side beam boss 213 in the up-down direction can be larger, so that the heat exchange medium can flow more smoothly in the collecting cavity 211; it can also facilitate at least a part of the end of the heat exchange element 31 to be located in the space between the first surface 2121 and the second surface 2131 in the up-down direction, thereby reducing the space occupied by the heat exchange element 31 on the inner side of the first side beam boss 213.

[0108] Reference Figure 6-Figure 9 In some embodiments, the end of the heat exchange element 31 is inserted into the first through hole 2111 .

[0109] By inserting the end of the heat exchanger 31 into the first through hole 2111 and communicating with the collecting chamber 211, the sealing between the first through hole 2111 and the end of the heat exchanger 31 can be enhanced, and the possibility of leakage of the heat exchange medium from the gap between the first through hole 2111 and the end of the heat exchanger 31 can be reduced. In addition, the contact area between the end of the heat exchanger 31 and the first side beam 21 can be enhanced, and the connection strength between the heat exchanger 31 and the first side beam 21 can be improved.

[0110] In the above technical solution, by inserting the end of the heat exchanger 31 into the first through hole 2111 and communicating with the collecting chamber 211, the sealing between the first through hole 2111 and the end of the heat exchanger 31 can be enhanced, and the possibility of leakage of the heat exchange medium from the gap between the first through hole 2111 and the end of the heat exchanger 31 can be reduced. In addition, the contact area between the end of the heat exchanger 31 and the first side beam 21 can be enhanced, and the connection strength between the heat exchanger 31 and the first side beam 21 can be improved.

[0111] Reference Figure 6-Figure 9 In some embodiments, the heat exchange element 31 includes a heat exchange body 311 and a heat exchange joint 312. The heat exchange joint 312 is connected to the end of the heat exchange body 311 and constitutes the end of the heat exchange element 31. A heat exchange flow channel is formed in the heat exchange body 311, and a connecting cavity is formed in the heat exchange joint 312. The connecting cavity connects the heat exchange flow channel and the collecting cavity 211. The heat exchange joint 312 and the heat exchange body 311 are independently formed.

[0112] A connecting cavity is formed in the heat exchange joint 312 and a heat exchange channel is formed in the heat exchange body 311. For example, at least a portion of the heat exchange joint 312 can be inserted into the first through hole 2111, so that the heat exchange channel and the collecting cavity 211 can be connected, thereby realizing the flow of heat exchange medium between the heat exchange channel and the collecting cavity 211; and, the heat exchange joint 312 and the heat exchange body 311 are independently formed, which can facilitate the processing and manufacturing of the heat exchange joint 312 and the heat exchange body 311, and can also facilitate the replacement or maintenance of the heat exchange joint 312 or the heat exchange body 311.

[0113] In the above technical solution, a connecting cavity is formed in the heat exchange joint 312 and a heat exchange channel is formed in the heat exchange body 311. For example, at least a portion of the heat exchange joint 312 can be inserted into the first through hole 2111, so that the heat exchange channel and the collecting cavity 211 can be connected, thereby realizing the flow of heat exchange medium between the heat exchange channel and the collecting cavity 211; and, the heat exchange joint 312 and the heat exchange body 311 are independently formed, which can facilitate the processing and manufacturing of the heat exchange joint 312 and the heat exchange body 311, and can also facilitate the replacement or maintenance of the heat exchange joint 312 or the heat exchange body 311.

[0114] Reference Figure 6-Figure 9 In some embodiments, the heat exchange joint 312 is welded to the first side beam 21 .

[0115] By welding the heat exchange joint 312 to the first side beam 21 , the connection between the heat exchange joint 312 and the first side beam 21 can be simple and have strong stability.

[0116] In the above technical solution, the heat exchange joint 312 is welded to the first side beam 21 , so that the connection between the heat exchange joint 312 and the first side beam 21 can be simple and have strong stability.

[0117] Reference Figure 6-Figure 9 In some embodiments, a connecting weld is formed between the heat exchange joint 312 and the first side beam 21 , and the connecting weld surrounds the outer peripheral side of the heat exchange joint 312 and seals the gap between the inner peripheral wall of the first through hole 2111 and the outer peripheral side of the heat exchange joint 312 .

[0118] By connecting the weld around the outer side of the heat exchange joint 312 and sealing the gap between the inner wall of the first through hole 2111 and the outer side of the heat exchange joint 312, the gap between the inner wall of the first through hole 2111 and the outer side of the heat exchange joint 312 can be better sealed, effectively reducing or avoiding the possibility of leakage of the cooling medium in the gap between the inner wall of the first through hole 2111 and the outer side of the heat exchange joint 312.

[0119] In the above technical solution, by connecting the weld around the outer side of the heat exchange joint 312 and sealing the gap between the inner wall of the first through hole 2111 and the outer side of the heat exchange joint 312, the gap between the inner wall of the first through hole 2111 and the outer side of the heat exchange joint 312 can be better sealed, effectively reducing or avoiding the possibility of leakage of the cooling medium in the gap between the inner wall of the first through hole 2111 and the outer side of the heat exchange joint 312.

[0120] Reference Figure 6-Figure 9 In some embodiments, the heat exchange joint 312 is welded to the heat exchange body 311 .

[0121] The heat exchange joint 312 is welded to the heat exchange body 311 , which can make the connection between the heat exchange joint 312 and the heat exchange body 311 simple and have strong stability.

[0122] In the above technical solution, the heat exchange joint 312 is welded to the heat exchange main body 311, so that the connection between the heat exchange joint 312 and the heat exchange main body 311 can be simple and have strong stability.

[0123] Reference Figure 6-Figure 9 In some embodiments, the heat exchange joint 312 is adhesively connected to the heat exchange body 311 .

[0124] The heat exchange joint 312 is bonded to the heat exchange body 311 , so that the connection between the heat exchange joint 312 and the heat exchange body 311 is simple and has strong stability.

[0125] In the above technical solution, the heat exchange joint 312 is bonded to the heat exchange body 311, so that the connection between the heat exchange joint 312 and the heat exchange body 311 can be simple and have strong stability.

[0126] Reference Figure 6-Figure 9 In some embodiments, the heat exchange body 311 is formed as a heat exchange flat tube and the heat exchange body 311 extends along a first direction, the first direction intersects with the up-down direction, the width direction of the heat exchange flat tube is consistent with the up-down direction, the heat exchange joint 312 is connected to the end of the heat exchange body 311 along the first direction, the graphic area enclosed by the outer contour line of the cross section of the heat exchange body 311 is the first cross-sectional area, the cross-sectional area of ​​the first through hole 2111 is the second cross-sectional area, and the second cross-sectional area is smaller than the first cross-sectional area.

[0127] The heat exchange body 311 is formed into a heat exchange flat tube and extends along a first direction, the first direction intersects with the up-down direction, and the width direction of the heat exchange flat tube is consistent with the up-down direction. Compared with the heat exchange body 311 formed as a heat exchange circular tube, the heat exchange area of ​​the heat exchange flat tube toward the battery cell side is larger, and more heat can be exchanged through the large surface area of ​​the heat exchange flat tube, which can improve the heat exchange efficiency between the heat exchange element 31 and the battery cell.

[0128] By connecting the heat exchange joint 312 to the end of the heat exchange body 311 along the first direction, the space occupied by the heat exchange joint 312 on the inner side of the first side beam 21 can be reduced, and the second cross-sectional area of ​​the first through hole 2111 is smaller than the first cross-sectional area of ​​the figure enclosed by the outer contour line of the cross-section of the heat exchange body 311. The larger first cross-sectional area can make the size of the heat exchange flow channel inside the heat exchange body 311 larger, so that the heat exchange medium can flow more smoothly inside the heat exchange body 311. For example, when the total amount of the heat exchange medium is constant, the smaller second cross-sectional area can speed up the flow velocity of the heat exchange medium at the first through hole 2111, so that it can quickly flow into the heat exchange body 311 or the collecting chamber 211, which is beneficial to improving the heat exchange efficiency.

[0129] In the above technical solution, the heat exchange body 311 is formed into a heat exchange flat tube and the heat exchange body 311 extends along the first direction, the first direction intersects with the up-down direction, and the width direction of the heat exchange flat tube is consistent with the up-down direction, so that the heat exchange area of ​​the heat exchange flat tube facing the battery cell side can be larger, which can improve the heat exchange efficiency between the heat exchange element 31 and the battery cell; and, the second cross-sectional area of ​​the first through hole 2111 is smaller than the first cross-sectional area of ​​the figure enclosed by the outer contour line of the cross-sectional area of ​​the heat exchange body 311. The larger first cross-sectional area can make the size of the heat exchange flow channel inside the heat exchange body 311 larger, so that the heat exchange medium can flow more smoothly inside the heat exchange body 311, which is beneficial to improving the heat exchange efficiency.

[0130] Reference Figure 6-Figure 9 In some embodiments, the end of the heat exchange body 311 is inserted into the heat exchange joint 312 .

[0131] By inserting the end of the heat exchange body 311 into the heat exchange joint 312, the sealing between the heat exchange joint 312 and the end of the heat exchange body 311 can be enhanced, and the possibility of leakage of the heat exchange medium from the gap between the heat exchange joint 312 and the end of the heat exchange body 311 can be reduced. In addition, the contact area between the end of the heat exchange body 311 and the heat exchange joint 312 can be enhanced, and the connection strength between the heat exchange body 311 and the heat exchange joint 312 can be improved.

[0132] In the above technical solution, by inserting the end of the heat exchange body 311 into the heat exchange joint 312, the sealing between the heat exchange joint 312 and the end of the heat exchange body 311 can be enhanced, and the possibility of leakage of the heat exchange medium from the gap between the heat exchange joint 312 and the end of the heat exchange body 311 can be reduced. In addition, the contact area between the end of the heat exchange body 311 and the heat exchange joint 312 can be enhanced, and the connection strength between the heat exchange body 311 and the heat exchange joint 312 can be improved.

[0133] Reference Figure 6-Figure 9 In some embodiments, the heat exchange joint 312 includes a first joint portion 313 and a second joint portion 314, the first joint portion 313 is connected between the second joint portion 314 and the heat exchange body 311, part of the connecting cavity is formed at the first joint portion 313 and the other part of the connecting cavity is formed at the second joint portion 314, the second joint portion 314 is formed into a columnar shape extending in the up and down directions, the second joint portion 314 includes a first section 3141 and a second section connected to the lower side of the first section 3141, the first joint portion 313 is connected to the first section 3141, and the second section is inserted into the first through hole 2111.

[0134] The first joint portion 313 is connected between the second joint portion 314 and the heat exchange main body 311, the second joint portion 314 includes a first section 3141 and a second section connected to the lower side of the first section 3141, the first joint portion 313 is connected to the first section 3141 and the second section is inserted into the first through hole 2111, so that the connection between the connecting cavity and the collecting channel can be realized, so that the heat exchange medium can flow between the heat exchange flow channel and the collecting channel through the connecting cavity; and, by arranging the first section 3141 and the second section in the up and down direction, the space in the up and down direction can be fully utilized to reduce the space occupied by the heat exchange joint 312 on the inner side of the first side beam 21.

[0135] In the above technical solution, the first joint part 313 is connected between the second joint part 314 and the heat exchange main body 311, the second joint part 314 includes a first section 3141 and a second section connected to the lower side of the first section 3141, the first joint part 313 is connected to the first section 3141 and the second section is inserted into the first through hole 2111, so as to realize the connection between the connecting cavity and the collecting channel, so as to facilitate the heat exchange medium to flow between the heat exchange flow channel and the collecting channel through the connecting cavity; and, by arranging the first section 3141 and the second section in the up and down direction, the space in the up and down direction can be fully utilized to reduce the space occupied by the heat exchange joint 312 on the inner side of the first side beam 21.

[0136] Reference Figure 6-Figure 9 In some embodiments, the cross section of the first through hole 2111 is circular, and the outer peripheral contour of the second joint portion 314 is circular.

[0137] The cross-section of the first through hole 2111 is circular and the outer contour of the second joint part 314 is circular, which can play a positioning role when the heat exchange joint 312 is assembled with the first side beam 21, reducing the assembly time and difficulty, which is beneficial to improving the assembly efficiency, and can also make the second joint part 314 more smoothly and accurately inserted into the first through hole 2111; and, the cross-section of the first through hole 2111 is circular and the outer contour of the second joint part 314 is circular, so that the cross-sectional area of ​​the second joint part 314 and the first through hole 2111 can be as close as possible, which can reduce the flow resistance of the heat exchange medium when it flows at the connection between the first through hole 2111 and the second joint part 314, so that the heat exchange medium can flow more smoothly from the collecting cavity 211 through the first through hole 2111 to the second joint part 314 or from the second joint part 314 through the first through hole 2111 to the collecting cavity 211, which is beneficial to improving the heat exchange efficiency of the heat exchange component 31.

[0138] In the above technical solution, the cross-section of the first through hole 2111 is circular and the outer peripheral contour of the second joint part 314 is circular, which can play a positioning role when the heat exchange joint 312 is assembled with the first side beam 21, so that the second joint part 314 can be inserted into the first through hole 2111 more smoothly and accurately, which is beneficial to improving the assembly efficiency; and the cross-section of the first through hole 2111 is circular and the outer peripheral contour of the second joint part 314 is circular, so that the cross-sectional area of ​​the second joint part 314 and the first through hole 2111 can be as close as possible, which can reduce the flow resistance of the heat exchange medium when it flows at the connection between the first through hole 2111 and the second joint part 314, so that the heat exchange medium can flow more smoothly from the collecting chamber 211 through the first through hole 2111 to the second joint part 314 or from the second joint part 314 through the first through hole 2111 to the collecting chamber 211, which is beneficial to improving the heat exchange efficiency of the heat exchange component 31.

[0139] Reference Figure 6-Figure 9 In some embodiments, the heat exchange body 311 is formed as a heat exchange flat tube and the heat exchange body 311 extends along a first direction, the first direction intersects with the up-down direction, the width direction of the heat exchange flat tube is consistent with the up-down direction, the heat exchange joint 312 is connected to the end of the heat exchange body 311 along the first direction, the first joint part 313 is formed in a flat shape and the thickness direction of the first joint part 313 is consistent with the thickness direction of the heat exchange flat tube.

[0140] The heat exchange body 311 is formed into a heat exchange flat tube and the heat exchange body 311 extends along a first direction, the first direction intersects with the up-down direction, and the width direction of the heat exchange flat tube is consistent with the up-down direction, so that the heat exchange area of ​​the heat exchange flat tube facing the battery cell side can be larger, which can improve the heat exchange efficiency between the heat exchange element 31 and the battery cell; and, the second cross-sectional area of ​​the first through hole 2111 is smaller than the first cross-sectional area of ​​the figure enclosed by the outer contour line of the cross-sectional area of ​​the heat exchange body 311. The larger first cross-sectional area can make the size of the heat exchange flow channel inside the heat exchange body 311 larger, so that the heat exchange medium can flow more smoothly inside the heat exchange body 311, which is beneficial to improving the heat exchange efficiency.

[0141] By forming the first joint portion 313 into a flat shape and aligning the thickness direction of the first joint portion 313 with the thickness direction of the heat exchange flat tube, the connection area between the first joint portion 313 and the heat exchange flat tube can be made larger. Compared with the first joint portion 313 being circular, the connection strength between the first joint portion 313 and the heat exchange flat tube can be enhanced. When the first joint portion 313 and the heat exchange flat tube are assembled, the flat shape of the first joint portion 313 can play a positioning role, so that the assembly position of the heat exchange joint 312 and the heat exchange flat tube can be accurate and can play a role in rapid positioning, which reduces the assembly time and difficulty and is conducive to improving the assembly efficiency.

[0142] In the above technical solution, the first joint part 313 is formed into a flat shape and the thickness direction of the first joint part 313 is consistent with the thickness direction of the heat exchange flat tube, so that the connection area between the first joint part 313 and the heat exchange flat tube can be larger. Compared with the first joint part 313 being circular, the connection strength between the first joint part 313 and the heat exchange flat tube can be enhanced. When the first joint part 313 and the heat exchange flat tube are assembled, the flat shape of the first joint part 313 can play a positioning role, so that the assembly position of the heat exchange joint 312 and the heat exchange flat tube is accurate and can play a role in rapid positioning, which reduces the assembly time and difficulty and is conducive to improving the assembly efficiency.

[0143] Reference Figure 6-Figure 9 In some embodiments, the first joint portion 313 includes a first connection portion 3131 and a second connection portion 3132, the first connection portion 3131 is connected to the heat exchange body 311, the second connection portion 3132 is connected between the first connection portion 3131 and the second joint portion 314, the second connection portion 3132 is located above the first through hole 2111, the width of the first connection portion 3131 in the up and down direction is W1, the width of the second connection portion 3132 in the up and down direction is W2, and W2 is smaller than W1.

[0144] By connecting the first connection part 3131 to the heat exchange body 311 and the second connection part 3132 between the first connection part 3131 and the second joint part 314, the connection between the first joint part 313 and the second joint part 314 can be achieved, and then the connection between the heat exchange body 311 and the first through hole 2111 can be achieved through the heat exchange joint 312.

[0145] By locating the second connection portion 3132 above the first through hole 2111 and making the width W2 of the second connection portion 3132 in the up-down direction smaller than the width W1 of the first connection portion 3131 in the up-down direction, the heat exchange body 311 can be connected to the first through hole 2111 via the first connection portion 3131 and the second connection portion 3132. The wider first connection portion 3131 can make the connection area between the first connection portion 3131 and the heat exchange body 311 larger, so that the first joint portion 313 and the heat exchange body 311 have a stronger connection strength, and the narrower second connection portion 3132 can reduce the occupation of the inner space of the first side beam 21, thereby accommodating more battery cells inside the first side beam 21, which is beneficial to improving the overall energy density of the battery device 100.

[0146] In the above technical solution, the second connection part 3132 is located above the first through hole 2111 and the width W2 of the second connection part 3132 in the up-down direction is smaller than the width W1 of the first connection part 3131 in the up-down direction. When the heat exchange body 311 is connected to the first through hole 2111 via the first connection part 3131 and the second connection part 3132, the wider first connection part 3131 can make the connection area between the first connection part 3131 and the heat exchange body 311 larger, so that the first joint part 313 and the heat exchange body 311 have a stronger connection strength, and the narrower second connection part 3132 can reduce the occupation of the inner space of the first side beam 21, thereby allowing the inner side of the first side beam 21 to accommodate more battery cells, which is beneficial to improving the overall energy density of the battery device 100.

[0147] Reference Figure 6-Figure 9 In some embodiments, the ratio of W2 to W1 ranges from 0.2 to 0.5.

[0148] For example, the ratio of W2 to W1 can be 0.2, 0.3, 0.4, 0.5, etc. By making the ratio of W2 to W1 not less than 0.2, the width of the second connection part 3132 in the up-down direction can be larger, so that the heat exchange medium can flow more smoothly in the second connection part 3132, reducing or avoiding the increase in the flow resistance of the heat exchange medium when flowing in the second connection part 3132 due to the small flow cross-section of the second connection part 3132; by making the ratio of W2 to W1 not greater than 0.5, the width of the first connection part 3131 in the up-down direction can be larger, so that the connection area between the first connection part 3131 and the heat exchange body 311 can be larger, thereby making the first joint part 313 and the heat exchange body 311 have a stronger connection strength.

[0149] By setting the ratio of W2 to W1 in the range of 0.2 to 0.5, the width of the second connection part 3132 in the up-down direction can be made larger, so that the heat exchange medium can flow more smoothly in the second connection part 3132. The width of the first connection part 3131 in the up-down direction can also be made larger, so that the connection area between the first connection part 3131 and the heat exchange body 311 is larger, thereby making the first joint part 313 and the heat exchange body 311 have a stronger connection strength.

[0150] In the above technical solution, by setting the ratio of W2 to W1 in the range of 0.2~0.5, the width of the second connection part 3132 in the up-down direction can be made larger, so that the heat exchange medium can flow more smoothly in the second connection part 3132, and the width of the first connection part 3131 in the up-down direction can be made larger, so that the connection area between the first connection part 3131 and the heat exchange main body 311 is larger, thereby making the first joint part 313 and the heat exchange main body 311 have a stronger connection strength.

[0151] Reference Figure 6-Figure 9 In some embodiments, part of the first connection portion 3131 is located below the first through hole 2111 , and part of the first connection portion 3131 is located above the first through hole 2111 .

[0152] By partially locating the first connection part 3131 above the first through hole 2111, the space in the up and down directions can be fully utilized, so that the width of the first connection part 3131 in the up and down directions can be maximized, thereby increasing the connection area between the first connection part 3131 and the heat exchange main body 311, and effectively enhancing the connection strength between the first connection part 3131 and the heat exchange main body 311.

[0153] In the above technical solution, by partially locating the first connection part 3131 above the first through hole 2111, the space in the up and down directions can be fully utilized, so that the width of the first connection part 3131 in the up and down directions can be larger, thereby making the connection area between the first connection part 3131 and the heat exchange main body 311 larger, and effectively enhancing the connection strength between the first connection part 3131 and the heat exchange main body 311.

[0154] Reference Figure 6-Figure 9 In some embodiments, the heat exchange body 311 is formed as a heat exchange flat tube, and a plurality of heat exchange channels are formed in the heat exchange body 311 and are arranged at intervals along the width direction of the heat exchange flat tube. All heat exchange channels in the heat exchange body 311 are connected to the connecting cavity.

[0155] A plurality of heat exchange channels are formed in the heat exchange main body 311 and are arranged at intervals along the width direction of the heat exchange flat tube, and all the heat exchange channels are connected to the connecting cavity, so that the heat exchange channels and the collecting cavity 211 can be connected, so that the heat exchange medium can flow between the collecting cavity 211 and the heat exchange channels; and the heat exchange medium can play a role in heat exchange for the battery monomer when flowing in the heat exchange channel. By arranging a plurality of heat exchange channels at intervals along the width direction of the heat exchange flat tube, the heat exchange area between the heat exchange main body 311 and the battery monomer can be increased, thereby enhancing the heat exchange efficiency of the heat exchange component 31 for the battery monomer.

[0156] In the above technical solution, a plurality of heat exchange channels are formed in the heat exchange main body 311 and are arranged at intervals along the width direction of the heat exchange flat tube, and all the heat exchange channels are connected to the connecting cavity, so that the heat exchange channels and the collecting cavity 211 can be connected, so that the heat exchange medium can flow between the collecting cavity 211 and the heat exchange channels; and by arranging the plurality of heat exchange channels at intervals along the width direction of the heat exchange flat tube, the heat exchange area between the heat exchange main body 311 and the battery cell can be increased, thereby enhancing the heat exchange efficiency of the heat exchange component 31 to the battery cell.

[0157] Reference Figure 1-Figure 5In some embodiments, there are two first side beams 21, the two first side beams 21 are opposite to each other along the first direction and the two first side beams 21 are arranged at intervals, each first side beam 21 is formed with a manifold 211 and a plurality of first through holes 2111 arranged at intervals along the second direction, the second direction, the first direction and the up and down directions intersect each other, one of the two first side beams 21 is provided with a liquid inlet hole connected to the manifold 211, and a liquid inlet pipe 42 is connected to the liquid inlet hole, the other of the two first side beams 21 is provided with a liquid outlet hole connected to the manifold 211, and a liquid outlet pipe 41 is connected to the liquid outlet hole, a plurality of heat exchange elements 31 are arranged at intervals along the second direction, at least some battery cells are located between adjacent heat exchange elements 31, and the two ends of each heat exchange element 31 along the first direction are respectively connected to the corresponding first through holes 2111 on the two first side beams 21, and the heat exchange flow channel in each heat exchange element 31 is connected to the manifold 211 in the two first side beams 21.

[0158] The fact that at least some of the battery cells are located between adjacent heat exchange elements 31 includes the following situations: for example, some of the battery cells may be located between adjacent heat exchange elements 31 ; for another example, all of the battery cells may be located between adjacent heat exchange elements 31 .

[0159] One of the first side beams 21 is provided with a liquid inlet hole connecting the manifold 211 and the liquid inlet pipe 42, so that the heat exchange medium can flow into the corresponding manifold 211 through the liquid inlet hole. The manifold 211 is used to collect the heat exchange medium and then flow into the heat exchange channel of each heat exchange component 31, so as to facilitate heat exchange of the battery cell. Another first side beam 21 is provided with a liquid outlet hole connecting the manifold 211 and the liquid outlet pipe 41, so that the heat exchange medium in the heat exchange channel of each heat exchange component 31 can flow to the corresponding manifold 211 through the liquid outlet hole after heat exchange. The manifold 211 is used to collect the heat exchange medium after heat exchange and then flow out through the liquid outlet pipe 41.

[0160] By locating at least part of the battery cells between adjacent heat exchange elements 31, since the temperature of the heat exchange medium can be adjusted, the heat exchange medium in the heat exchange flow channel of the heat exchange element 31 can exchange heat for the battery cells. For example, when the temperature of the battery cells is too high, the heat exchange medium can cool the battery cells. When the temperature of the battery cells is too low, the heat exchange medium can keep the battery cells warm, thereby increasing the service life of the battery cells.

[0161] For example, when the heat exchange element 31 is working, the heat exchange medium may flow from the liquid inlet pipe 42 into the corresponding manifold 211 through the liquid inlet hole, and be diverted by the manifold 211 to the heat exchange channels of each heat exchange element 31 to exchange heat for the battery cells. The heat exchange medium after heat exchange in each heat exchange channel flows to the manifold 211 corresponding to the liquid outlet hole, and then flows out through the liquid outlet pipe 41.

[0162] Of course, the heat exchange medium in the manifold 211 on the first side beam 21 can also play a role in heat exchange for the battery cells.

[0163] In the above technical scheme, a liquid inlet hole connecting the collecting chamber 211 and the liquid inlet pipe 42 is provided on one of the first side beams 21, and a liquid outlet hole connecting the collecting chamber 211 and the liquid outlet pipe 41 is provided on the other first side beam 21. The heat exchange medium flows from the liquid inlet pipe 42 through the liquid inlet hole into the corresponding collecting chamber 211, and is diverted by the collecting chamber 211 to the heat exchange channels of each heat exchange component 31 to exchange heat for the battery cells. The heat exchange medium after heat exchange in each heat exchange channel flows to the collecting chamber 211 corresponding to the liquid outlet hole, and then flows out through the liquid outlet pipe 41. In addition, since at least part of the battery cells are located between adjacent heat exchange components 31, and since the temperature of the heat exchange medium can be adjusted, the heat exchange medium in the heat exchange channel of the heat exchange component 31 can exchange heat for the battery cells, which is beneficial to extending the service life of the battery cells.

[0164] Reference Figure 2-Figure 5 In some embodiments, the liquid inlet hole is formed on the upper surface of the first side beam 21 , and the liquid outlet hole is formed on the upper surface of the first side beam 21 .

[0165] By forming a liquid inlet hole on the upper surface of the first side beam 21 and a liquid outlet hole on the upper surface of the first side beam 21, the liquid inlet pipe 42 or the liquid outlet pipe 41 can be located above the first side beam 21 to be connected to the liquid inlet hole or the liquid outlet hole. Compared with the liquid inlet hole and the liquid outlet hole being formed on the inner side of the first side beam 21, this can reduce the space occupied by the inner side of the first side beam 21, so that more battery cells can be accommodated in the space inside the first side beam 21, which is beneficial to improve the energy density of the battery device 100.

[0166] In the above technical solution, the liquid inlet hole is formed on the upper surface of the first side beam 21 and the liquid outlet hole is formed on the upper surface of the first side beam 21, so that the liquid inlet pipe 42 or the liquid outlet pipe 41 can be located above the first side beam 21 to be connected to the liquid inlet hole or the liquid outlet hole, which can reduce the occupation of the space inside the first side beam 21. In this way, more battery cells can be accommodated in the space inside the first side beam 21, which is beneficial to improve the energy density of the battery device 100.

[0167] Reference Figure 5 and Figure 6 In some embodiments, the liquid inlet and the liquid outlet are both arranged at one end of the first side beam 21 along the second direction, and the liquid outlet and the liquid inlet are located at the same end of the first side beam 21 along the second direction.

[0168] By providing both the liquid inlet and the liquid outlet at one end of the first side beam 21 along the second direction, and the liquid outlet and the liquid inlet are located at the same end of the first side beam 21 along the second direction, the liquid inlet pipe 42 and the liquid outlet pipe 41 can be relatively concentratedly provided on the same side of the box body 20, thereby effectively saving space inside the box body 20, reducing the crossing or detour of the liquid inlet pipe 42 or the liquid outlet pipe 41 inside the box body 20, and facilitating the optimization of the layout inside the box body 20.

[0169] In the above technical solution, the liquid inlet hole and the liquid outlet hole are both arranged at one end of the first side beam 21 along the second direction, and the liquid outlet hole and the liquid inlet hole are located at the same end of the first side beam 21 along the second direction, so that the liquid inlet pipe 42 and the liquid outlet pipe 41 can be more concentratedly arranged on the same side of the box body 20, which can effectively save the space inside the box body 20, reduce the crossing or detour of the liquid inlet pipe 42 or the liquid outlet pipe 41 inside the box body 20, and is conducive to the optimization of the layout inside the box body 20.

[0170] Refer to the following Figure 1-Figure 9 A battery device 100 according to some embodiments of the present application is described.

[0171] In this embodiment, the battery device 100 includes a box body 20, a plurality of battery cells, a heat exchange assembly 30, a liquid inlet pipe 42, and a liquid outlet pipe 41. The box body 20 includes a side beam, and the side beam includes a first side beam 21. A manifold 211 is provided in the first side beam 21. A first through hole 2111 communicating with the manifold 211 is provided on the upper surface of the first side beam 21. A plurality of battery cells are provided in the box body 20. The heat exchange assembly 30 includes a plurality of heat exchange elements 31. The heat exchange elements 31 are used to exchange heat with the battery cells. The heat exchange elements 31 have heat exchange channels. There are a plurality of first through holes 2111 arranged at intervals along the extension direction of the first side beam 21. The end of each heat exchange element 31 is connected to the corresponding first through hole 2111, so that the heat exchange channel of each heat exchange element 31 is connected with the manifold 211.

[0172] There are two first side beams 21, and the two first side beams 21 are opposite to each other and arranged at intervals along the first direction. Each first side beam 21 is formed with a collecting cavity 211 and a plurality of first through holes 2111 arranged at intervals along the second direction. The second direction, the first direction, and the up and down directions intersect each other. One of the two first side beams 21 is provided with a liquid inlet hole connected to the collecting cavity 211, and a liquid inlet pipe 42 is connected to the liquid inlet hole. The other of the two first side beams 21 is provided with a liquid outlet hole connected to the collecting cavity 211, and a liquid outlet pipe 41 is connected to the liquid outlet hole. Multiple heat exchange elements 31 are arranged at intervals along the second direction, and at least some battery cells are located between adjacent heat exchange elements 31. The two ends of each heat exchange element 31 along the first direction are respectively connected to the corresponding first through holes 2111 on the two first side beams 21, and the heat exchange flow channel in each heat exchange element 31 is connected to the collecting cavity 211 in the two first side beams 21.

[0173] The liquid inlet hole is formed on the upper surface of the first side beam 21, and the liquid outlet hole is formed on the upper surface of the first side beam 21. The liquid inlet hole and the liquid outlet hole are both arranged at one end of the first side beam 21 along the second direction, and the liquid outlet hole and the liquid inlet hole are located at the same end of the first side beam 21 along the second direction.

[0174] The first side beam 21 includes a first side beam body 212 and a first side beam boss 213. The first side beam boss 213 is connected to the inner side of the first side beam body 212. A manifold 211 is provided in the first side beam boss 213. The upper surface of the first side beam body 212 is a first surface 2121. The upper surface of the first side beam boss 213 is a second surface 2131. The second surface 2131 is provided with a first through hole 2111. The second surface 2131 is lower than the first surface 2121. The height difference between the first surface 2121 and the second surface 2131 is h. The size of the first side beam body 212 in the up-down direction is d1, and the ratio of h to d1 is in the range of 0.3 to 0.7. The size of the first side beam boss 213 in the up-down direction is d2, and the ratio of d2 to d1 is in the range of 0.3 to 0.7.

[0175] The end of the heat exchanger 31 is inserted into the first through hole 2111. The heat exchanger 31 includes a heat exchange body 311 and a heat exchange joint 312. The heat exchange joint 312 is connected to the end of the heat exchange body 311 and constitutes the end of the heat exchanger 31. A heat exchange flow channel is formed in the heat exchange body 311, and a connecting cavity is formed in the heat exchange joint 312. The connecting cavity connects the heat exchange flow channel and the collecting cavity 211. The heat exchange joint 312 and the heat exchange body 311 are independently formed, and the heat exchange joint 312 and the heat exchange body 311 are welded or bonded.

[0176] The heat exchange joint 312 is welded to the first side beam 21 , and a connecting weld is formed between the heat exchange joint 312 and the first side beam 21 . The connecting weld surrounds the outer peripheral side of the heat exchange joint 312 and seals the gap between the inner peripheral wall of the first through hole 2111 and the outer peripheral side of the heat exchange joint 312 .

[0177] The heat exchange body 311 is formed as a heat exchange flat tube and extends along a first direction, the first direction intersects with the up-down direction, the width direction of the heat exchange flat tube is consistent with the up-down direction, the heat exchange joint 312 is connected to the end of the heat exchange body 311 along the first direction, the graphic area enclosed by the outer contour line of the cross section of the heat exchange body 311 is the first cross-sectional area, the cross-sectional area of ​​the first through hole 2111 is the second cross-sectional area, and the second cross-sectional area is smaller than the first cross-sectional area.

[0178] The end of the heat exchange body 311 is inserted into the heat exchange joint 312, and the heat exchange joint 312 includes a first joint part 313 and a second joint part 314. The first joint part 313 is connected between the second joint part 314 and the heat exchange body 311. Part of the communication cavity is formed in the first joint part 313 and the other part of the communication cavity is formed in the second joint part 314. The second joint part 314 is formed in a columnar shape extending in the up-down direction. The second joint part 314 includes a first section 3141 and a second section connected to the lower side of the first section 3141. The first joint part 313 is connected to the first section 3141, and the second section is inserted into the first through hole 2111. The cross section of the first through hole 2111 is circular, and the outer peripheral contour of the second joint part 314 is circular.

[0179] The first joint part 313 is formed in a flat shape and the thickness direction of the first joint part 313 is consistent with the thickness direction of the heat exchange flat tube. The first joint part 313 includes a first connection part 3131 and a second connection part 3132. The first connection part 3131 is connected to the heat exchange body 311, and the second connection part 3132 is connected between the first connection part 3131 and the second joint part 314. The second connection part 3132 is located above the first through hole 2111. The width of the first connection part 3131 in the vertical direction is W1, and the width of the second connection part 3132 in the vertical direction is W2. W2 is smaller than W1, and the ratio of W2 to W1 ranges from 0.2 to 0.5. Part of the first connection part 3131 is located below the first through hole 2111, and part of the first connection part 3131 is located above the first through hole 2111.

[0180] The heat exchange body 311 is formed as a heat exchange flat tube, and a plurality of heat exchange channels are formed in the heat exchange body 311 and are arranged at intervals along the width direction of the heat exchange flat tube. All the heat exchange channels in the heat exchange body 311 are connected to the communication cavity.

[0181] For example, when the heat exchange element 31 is working, the heat exchange medium may flow from the liquid inlet pipe 42 into the corresponding manifold 211 through the liquid inlet hole, and be diverted by the manifold 211 to the heat exchange channels of each heat exchange element 31 to exchange heat for the battery cells. The heat exchange medium after heat exchange in each heat exchange channel flows to the manifold 211 corresponding to the liquid outlet hole, and then flows out through the liquid outlet pipe 41.

[0182] By utilizing the space inside the first side beam 21, a collecting chamber 211 is formed inside the first side beam 21 and the end of the heat exchange element 31 is directly connected to the collecting chamber 211 through the first through hole 2111 on the first side beam 21, so that the heat exchange medium can flow between the heat exchange element 31 and the collecting chamber 211, without having to set up a collecting pipe separately, thereby reducing the number of parts. The omitted collecting pipe can save space in the box body 20 for placing more battery cells, thereby improving the utilization rate of the internal space of the box body 20; and, by forming the first through hole 2111 on the upper surface of the first side beam 21, at least a part of the heat exchange element 31 can be located at the upper part of the first side beam 21 to be connected to the collecting chamber 211, which can further reduce the occupation of the space inside the first side beam 21 by the heat exchange element 31, so that more battery cells can be accommodated in the space inside the first side beam 21, which is beneficial to improving the energy density of the battery device 100.

[0183] Reference Figure 6-Figure 10 In a second aspect, the present application provides an electrical device, including a battery device 100 implemented according to the first aspect of the present application.

[0184] The electrical device may be a vehicle 1000 , and the battery device 100 may be installed at the bottom of the vehicle body 200 .

[0185] In the above technical solution, by utilizing the space inside the first side beam 21 of the battery device 100, by forming a collecting chamber 211 inside the first side beam 21 and directly connecting the end of the heat exchange element 31 with the collecting chamber 211 through the first through hole 2111 on the first side beam 21, the process of heat exchange medium flowing between the heat exchange element 31 and the collecting chamber 211 can be realized, and there is no need to set up a collecting pipe separately, thereby reducing the number of parts. The omitted collecting pipe can save space in the box 20 for placing more battery cells, thereby improving the utilization rate of the internal space of the box 20; and, by forming the first through hole 2111 on the upper surface of the first side beam 21, at least part of the heat exchange element 31 can be located at the upper part of the first side beam 21 to connect with the collecting chamber 211, which can further reduce the occupation of the space inside the first side beam 21 by the heat exchange element 31, so that more battery cells can be accommodated in the space inside the first side beam 21, which is beneficial to improving the energy density of the battery device 100.

[0186] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0187] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A battery device, characterized in that: include: A box body, the box body comprises side beams, the side beams comprise first side beams, a manifold is provided in the first side beam, and a first through hole communicating with the manifold is provided on an upper surface of the first side beam; A plurality of battery cells, wherein the plurality of battery cells are arranged in the box; A heat exchange assembly, wherein the heat exchange assembly includes a plurality of heat exchange parts, wherein the heat exchange parts are used to exchange heat with the battery cells, wherein a heat exchange flow channel is provided inside the heat exchange parts, wherein the first through holes are multiple and are arranged at intervals along the extension direction of the first side beam, and an end portion of each of the heat exchange parts is connected to the corresponding first through hole so that the heat exchange flow channel of each of the heat exchange parts is connected to the collecting chamber.

2. The battery device according to claim 1, characterized in that: The first side beam includes a first side beam body and a first side beam boss, the first side beam boss is connected to the inner side of the first side beam body, the first side beam boss is provided with the collecting cavity, the upper surface of the first side beam body is the first surface, the upper surface of the first side beam boss is the second surface, the second surface is provided with the first through hole, and the second surface is lower than the first surface.

3. The battery device according to claim 2, characterized in that: The height difference between the first surface and the second surface is h, the size of the first side beam body in the up-down direction is d1, and the ratio of h to d1 is in the range of 0.3 to 0.

7.

4. The battery device according to claim 2, characterized in that: The size of the first side beam body in the up-down direction is d1, the size of the first side beam boss in the up-down direction is d2, and the ratio of d2 to d1 is in the range of 0.3 to 0.

7.

5. The battery device according to claim 1, characterized in that: An end portion of the heat exchange element is inserted into the first through hole.

6. The battery device according to claim 5, characterized in that: The heat exchange element includes a heat exchange body and a heat exchange joint, the heat exchange joint is connected to the end of the heat exchange body and constitutes the end of the heat exchange element, the heat exchange body is formed with the heat exchange channel, the heat exchange joint is formed with a connecting cavity, the connecting cavity connects the heat exchange channel and the collecting cavity, and the heat exchange joint and the heat exchange body are independently formed.

7. The battery device according to claim 6, characterized in that: The heat exchange joint is welded to the first side beam.

8. The battery device according to claim 7, characterized in that: A connecting weld is formed between the heat exchange joint and the first side beam, and the connecting weld surrounds the outer circumference of the heat exchange joint and seals the gap between the inner circumferential wall of the first through hole and the outer circumference of the heat exchange joint.

9. The battery device according to claim 6, characterized in that: The heat exchange joint is connected to the heat exchange body by welding; or, the heat exchange joint is connected to the heat exchange body by bonding.

10. The battery device according to claim 6, characterized in that: The heat exchange body is formed as a heat exchange flat tube and extends along a first direction, the first direction intersects with the up-down direction, the width direction of the heat exchange flat tube is consistent with the up-down direction, the heat exchange joint is connected to the end of the heat exchange body along the first direction, the graphic area enclosed by the outer contour line of the cross section of the heat exchange body is the first cross-sectional area, the cross-sectional area of ​​the first through hole is the second cross-sectional area, and the second cross-sectional area is smaller than the first cross-sectional area.

11. The battery device according to claim 6, characterized in that: The end of the heat exchange body is inserted into the heat exchange joint.

12. The battery device according to claim 6, characterized in that: The heat exchange joint includes a first joint portion and a second joint portion, the first joint portion is connected between the second joint portion and the heat exchange body, a portion of the connecting cavity is formed at the first joint portion and another portion of the connecting cavity is formed at the second joint portion, the second joint portion is formed into a columnar shape extending in the up and down directions, the second joint portion includes a first section and a second section connected to the lower side of the first section, the first joint portion is connected to the first section, and the second section is inserted into the first through hole.

13. The battery device according to claim 12, characterized in that: The cross section of the first through hole is circular, and the outer peripheral contour of the second joint portion is circular.

14. The battery device according to claim 12, characterized in that: The heat exchange body is formed as a heat exchange flat tube and extends along a first direction, the first direction intersects with the up-down direction, the width direction of the heat exchange flat tube is consistent with the up-down direction, the heat exchange joint is connected to the end of the heat exchange body along the first direction, the first joint part is formed in a flat shape, and the thickness direction of the first joint part is consistent with the thickness direction of the heat exchange flat tube.

15. The battery device according to claim 14, characterized in that: The first joint portion includes a first connection portion and a second connection portion, the first connection portion is connected to the heat exchange body, the second connection portion is connected between the first connection portion and the second joint portion, the second connection portion is located above the first through hole, the width of the first connection portion in the up and down direction is W1, the width of the second connection portion in the up and down direction is W2, and W2 is smaller than W1.

16. The battery device according to claim 15, characterized in that: The ratio of W2 to W1 ranges from 0.2 to 0.

5.

17. The battery device according to claim 15, characterized in that: A portion of the first connection portion is located below the first through hole, and a portion of the first connection portion is located above the first through hole.

18. The battery device according to claim 6, characterized in that: The heat exchange body is formed as a heat exchange flat tube, and a plurality of heat exchange channels arranged at intervals along the width direction of the heat exchange flat tube are formed in the heat exchange body, and all the heat exchange channels in the heat exchange body are connected to the communication cavity.

19. The battery device according to claim 1, characterized in that: There are two first side beams, and the two first side beams are opposite to each other and spaced apart along the first direction. Each of the first side beams is formed with the collecting chamber and a plurality of the first through holes spaced apart along the second direction. The second direction, the first direction and the up and down directions intersect each other. One of the two first side beams is provided with a liquid inlet hole connected to the collecting chamber, and a liquid inlet pipe is connected to the liquid inlet hole. The other of the two first side beams is provided with a liquid outlet hole connected to the collecting chamber, and a liquid outlet pipe is connected to the liquid outlet hole. A plurality of the heat exchange elements are spaced apart along the second direction, and at least some of the battery cells are located between adjacent heat exchange elements. The two ends of each heat exchange element along the first direction are respectively connected to the corresponding first through holes on the two first side beams, and the heat exchange channel in each heat exchange element is connected to the collecting chambers in the two first side beams.

20. The battery device according to claim 19, characterized in that The liquid inlet hole is formed on the upper surface of the first side beam, and the liquid outlet hole is formed on the upper surface of the first side beam.

21. The battery device according to claim 19, characterized in that The liquid inlet and the liquid outlet are both arranged at one end of the first side beam along the second direction, and the liquid outlet and the liquid inlet are located at the same end of the first side beam along the second direction.

22. An electrical device, characterized in that: include: A battery device according to any one of claims 1 to 21.

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